Keystones — Lintel
Five GCSE retrieval questions · 15 September 2022 · mathsvault.uk/keystones
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1. Number Converting to standard form
0.00058
Answer: 5.8 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 24
Answer: (x + 6)(x - 4) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 16cm, angle = 31°. Find opposite
Answer: 9.6cm -
4. Ratio Mixed ratio problems
Divide 250 in the ratio 3:3:4
Answer: 75, 75 and 100 -
5. Statistics Mean
The mean of 4 numbers is 35. If 3 of them are 21, 38, 46, what is the missing number?
Answer: 35